Solve the problem.Suppose that the random variables (X, Y) have joint PDF 
Find k and P(Y > 4).
A. 
; 4.22
B. 
; 0.7
C. 36; 4.22
D. 36; 0.7
Answer: B
Mathematics
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Express the phrase as a ratio in lowest terms.21 in. to 6 in.
A. 
B. 
C. 
D. 
Mathematics
Find the exact value. Do not use a calculator.cos 
A. 
B. - 
C. - 
D. 
Mathematics
Solve the problem.The time T necessary to make an enlargement of a photo negative varies directly as the area A of the enlargement. If 180 seconds are required to make a 5-by-4 enlargement, find the time required for a 
enlargement.
A. 336 sec B. 420 sec C. 378 sec D. 462 sec
Mathematics
The line graph shows the recorded hourly temperatures in degrees Fahrenheit at an airport. 
At what time was the temperature 72°?
A. 6 p.m. B. 9 a.m. C. 10 a.m. D. 9 a.m. and 10 a.m.
Mathematics